<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header
      ><div>
        <img src="../assets/heima.png" alt="" /> <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          :collapse="isCollapse"
          :collapse-transition="false"
          unique-opened
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          :router="true"
          :default-active="activePath"
        >
          <!-- 一级菜单的模板区域 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path + ''"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path + '')"
              ><template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template></el-menu-item
            >
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 主体区 -->
      <el-main><router-view></router-view></el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 定义一个数组，用来接收getMenuList()获取的数据
      menulist: [],
      iconsObj: {
        125: "iconfont icon-user",
        103: "iconfont icon-tijikongjian",
        101: "iconfont icon-shangpin",
        102: "iconfont icon-danju",
        145: "iconfont icon-baobiao",
      },
      //是否折叠
      isCollapse: false,
      //被激活的链接地址
      activePath: "",
    };
  },

  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem("activePath");
  },
  methods: {
    logout() {
      //清空
      window.sessionStorage.clear();
      //重定向
      this.$router.push("/login");
    },
    //获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      // console.log(res);
      if (res.meta.status !== 200) {
        return this.$message.error("获取菜单数据失败！");
      }
      this.menulist = res.data;
      //验证你也要带个this，要不也报错，我还愣了好久
      // console.log(this.menulist);
    },
    //点击按钮切换菜单的折叠状态
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    //保存链接的激活状态
    saveNavState(activePath) {
      //将activePath保存到客户端的sessionStorage中
      window.sessionStorage.setItem("activePath", activePath);
      this.activePath = activePath;
    },
  },
};
</script>

<style lang="less" scoped>
.el-header {
  background-color: #373d41;
  display: flex;
  //左右贴边对齐, 用div包着好布局，要不那行字杵在中间了
  justify-content: space-between;
  padding-left: 0;
  //居中对齐
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    // 纵向上实现居中对齐
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.home-container {
  height: 100%;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  //字体大小
  font-size: 10px;
  //行高
  line-height: 24px;
  // 字体颜色
  color: #fff;
  //居中对齐
  text-align: center;
  //两字符间距为0.2个字体大小
  letter-spacing: 0.2em;
  //鼠标放上去变成一个小手
  cursor: pointer;
}
</style>